The Hinsberg reagent is

Abenzenesulfonyl chloride, $C X_{6} H X_{5} SO X_{2} Cl$
Bbenzenediazonium chloride
Cbenzoyl chloride, $C X_{6} H X_{5} COCl$
Dacetyl chloride, $CH X_{3} COCl$

Answer: A

The Hinsberg test uses benzenesulfonyl chloride to distinguish primary, secondary and tertiary amines by the solubility of the resulting sulfonamide in alkali.

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